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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3c1a2f6f2457637afa790937d5439e9c89e2716dd9d6f5ac685dbd1c1369ee6' 
  AND token = '+aMWcQFMpPQzfb1AdFnzzboGpJOtVAeAOBCc3idF20U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}